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Warns if <code>Map</code> key or <code>Set</code> element was overwritten in the sequence of add/put calls or using a Java 9 factory method
like <code>Set.of</code> (which will result in runtime exception). This usually occurs due to copy-paste error. Example:
<pre>
  map.put("A", 1);
  map.put("B", 2);
  map.put("C", 3);
  map.put("D", 4);
  map.put("A", 5); // duplicating key "A", overwrites previously written entry
</pre>
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<p><small>New in 2017.3</small></p>
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